Melting and refining manuscript notebook, c. 1908-1909, of Edwin Ralph Leach (1878-1971), while he was Director of Melting and Refining at the San Francisco Mint. Leach was the son of Frank A. Leach, Superintendent of the San Francisco Mint (1897-1907) and Director of the U.S. Mint (1907-1909). Forty-two (42) pages of the notebook contain handwritten details about the process of melting and refining metals at the various U.S. Mints and affiliated smelting companies, including the San Francisco Mint, the Philadelphia Mint, Balbach Smelting & Refining Company (Newark, N.J.), U.S. Metals Refining Company, et al. His handwritten notes provide details on the melting and refining of various metals, including copper, silver, platinum and gold. Manuscript drawings are here and there among the text. Written on the front page is: "PROPERTY OF / E. R. LEACH / U.S. MINT / SAN FRANCISCO".

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